OpenRouter

OpenRouter is an open source router that connects requests to different AI models through a unified interface. Instead of integrating each provider separately, you point your application at OpenRouter and select from a range of well known models, which keeps the integration surface small even when you switch models later. The service also lets you compare the price and quality of different models side by side, which is useful when you want an inexpensive option for simple tasks and a stronger one for difficult ones. Some models on the platform are free to use, and the free model list along with any rate limits are set by the official site. It is a developer facing tool rather than a chat product: you bring your own application and it handles the routing.

- Access multiple AI models through one API and one interface.

- Compare model pricing and quality before choosing one for a task.

- Route different request types to different models inside a single product.

- Start on free models and move to paid ones as your usage grows.

- Developers building products that need more than one model provider behind them.

- Teams that want to compare model cost and quality in one place instead of signing up everywhere.

- Users assembling a cost effective chatbot or question answering setup.

Because OpenRouter routes to third party models, availability, pricing, and behavior depend on those upstream providers and can change without notice, so build fallbacks into anything important. The set of free models and the limits attached to them are set by the official site, which means the free list should be treated as a moving target rather than a fixed promise. Model quality varies widely across the catalog, so evaluate candidates on your own prompts instead of trusting headline comparisons.